It's strong on champions that either
a) lack sustain need an extra ad-scaling spell to burst people harder (Riven, Zed, Pantheon)
b) have the elusive combination of ad-steroid, lifesteal steroid, attack speed steroid, and enough durability to sit in the middle of the enemy team and use all those steroids (Nocturne has two steroids and a spell shield that gives even more AS, Lee Sin has AS and lifesteal and a shield/armor buff, Olaf has all of those, Mundo has the AD steroid and a ton of survivability, AD Sion has all of those, Nasus has AD, lifesteal and durability)
The active and the passive seem to not work together well. It seems like an item for melee ad carries to clear jungle with, but melee ad carries aren't viable in general and the item is too expensive for just jungle clearing.